Ford rates them at 7,600-8,300 lbs towing. I'd keep it under 5,000 lbs with 3.31 or 3.55 gears. Under 5,750 lbs with the 3.73's. Think 25-27' lightweight with 1 slide.
Lower profile, less height. Keep width 96" or preferably less. Frontal area will be a limiting factor depending on towing/cooling options, you'll be limited to 55-60 sq ft.
Will it pull a trailer? Yes.
A big trailer? No.
It would pull a 4500 lb 24' trailer fine. Anything more, after a couple hours, you'll be wishing you had the V8 or the 3.5 EB.